Figure 4.

Detection of neutralizing antibodies in sera against SARS-CoV-2 pseudovirus infection. (A) Inhibition of SARS-CoV-2 pseudovirus entry by ACE2-Ig. S-C19del or VSV-G pseudovirions were preincubated with ACE2-Ig and added to 293T-ACE2 cells. (B) Sera from convalescent COVID-19 patients neutralized the SARS-CoV-2 pseudovirus. Serum sample from healthy individual was tested as a negative control. RLU were detected at 72 h post-pseudovirus inoculation. The data are presented as the mean percentages of inhibition ± SDs of duplicate wells.